نتایج جستجو برای: expansion of rain irrigation
تعداد نتایج: 21178589 فیلتر نتایج به سال:
The article presents the results of research on effect sprinkling structural and aggregate composition soil its density. high quality irrigation is achieved with uniform distribution rain over area, acceptable intensity drop diameter impact force, at which plants structure are not damaged, puddles surface runoff formed. For complete absorption water into preservation low intensity, small drops ...
Ethiopia’s food supply and economy in general is largely dependent on rain-fed agriculture. Hence, irrigation development vital to minimize the risk of crop failure sustain agricultural production. The purpose this review was collect published unpublished information from relevant sources then synthesize key trends status challenges threatening its implementation sustainability. Historically, t...
The assessment of actual performance and potential improvement of conveyance and distribution systems received greater attention in recent years, and this trend will most likely extend to the near future, given that public and private investments will be more addressed to modernization of ageing or poor-performing irrigation schemes rather than to development of new irrigated areas or to expans...
Changes in summer irrigated cropland acreage and related water use are estimated from satellite remote sensing and ancillary data in semi-arid Southeastern Turkey where traditionally dry agricultural lands are being rapidly transformed into irrigated fields with the help of water from the Euphrates-Tigris Rivers. An image classification methodology based on thresholding of Landsat NDVI images f...
Abstract Over the years, research has been directed to investigate radar as potential tools for estimating rain. The reflectivity is measured by comparing location of rain gauge and associated vertical path at certain altitude. latitude longitude identified pinpoint exact using Rainbow®5 meteorological software. In this work, was estimated S-band Terminal Doppler Weather Radar (TWDR) data Malay...
INTRODUCTION In Zambia, agriculture continues to be an important source of livelihood, supporting about 70% of the population. The country’s agriculture sector is dominated by small scale rural farmers, who largely depend on rain for crop production, mainly due to the absence of irrigation equipment in most rural communities. Thus any change in climate, mostly manifested as an increase in frequ...
In recent years agricultural practices in New England have undergone dramatic changes. Traditional dryland crops such as potatoes and silage corn have been replaced by irrigated “landscape” crops; specifically turf and nursery crops. For example, commercial sod production in Rhode Island has risen from 200 acres in 1972 to over 2,500 acres in 1986, while potato acreage has shown a similm declin...
The effect of water supply during grain growth on grain nitrogen concentration (GNC) and grain nitrogen yield (GNY) of winter wheat (Triticum aestivum L.) was studied in the field experiment on fertile loamy-clay soil in years 2004–2007. The water regime was differentiated using mobile rain shelter (water shortage, treatment S) and drip irrigation (ample water supply, treatment W); rain-fed cro...
The advanced development in wireless sensor networks can be used in monitoring various parameters in agriculture. Due to uneven natural distribution of rain water it is very difficult for farmers to monitor and control the distribution of water to agriculture field in the whole farm or as per the requirement of the crop. There is no ideal irrigation method for all weather conditions, soil struc...
Intensive residential use of insecticides has resulted in their ubiquitous presence as contaminants in urban surface streams. For pest eradication, urban hard surfaces such as concrete are often directly treated with pesticides, and wind/water can also carry pesticides onto hard surfaces from surrounding areas. This study expanded on previous bench-scale studies by considering pesticide runoff ...
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